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Code Issues Releases Activity

SVC: Advance time when calling GetSystemTick to escape busy-wait loops

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Cubic Ninja waited for the frame to end by spinning on a loop calling
GetSystemTick while doing nothing else. Since GetSystemTick doesn't
cause a reschedule (which advances time), this meant that very little
emulated time would pass inside that loop, causing the game to spend
most of the frame burning away CPU.
This commit is contained in:
Yuri Kunde Schlesner 2015-08-25 23:47:29 -03:00
parent ac0104b8b0
commit 18c1c39d5e
1 changed files with 4 additions and 1 deletions
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5
src/core/hle/svc.cpp
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@ -755,7 +755,10 @@ static void SleepThread(s64 nanoseconds) {
/// This returns the total CPU ticks elapsed since the CPU was powered-on /// This returns the total CPU ticks elapsed since the CPU was powered-on
static s64 GetSystemTick() { static s64 GetSystemTick() {
return (s64)CoreTiming::GetTicks(); s64 result = CoreTiming::GetTicks();
// Advance time to defeat dumb games (like Cubic Ninja) that busy-wait for the frame to end.
Core::g_app_core->AddTicks(150); // Measured time between two calls on a 9.2 o3DS with Ninjhax 1.1b
return result;
} }
/// Creates a memory block at the specified address with the specified permissions and size /// Creates a memory block at the specified address with the specified permissions and size